There are three ways you can get the files for Marlin.
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You can get the tarball at http://sourceforge.net/project/showfiles.php?group_id=53043
CVS is a method for developers to keep up to date with file changes. To get Marlin from CVS, you need to first log into the CVS server by typing:
cvs -d:pserver:email@example.com:/cvsroot/marlin login
When prompted for a password, simply press the Enter key. Next you need to get the files from the server. Type:
cvs -d:pserver:firstname.lastname@example.org:/cvsroot/marlin checkout marlin
After a while all the files will be checked out into the marlin directory.
To update your marlin directory, cd into it, and type:
cvs -z3 update -dP
See here for more information on obtaining Marlin through CVS.